We have a GatewayScript user defined policy that worked properly with Datapower Gateway 7.4, but in versión 7.6 we are unable to access neither the variable 'request.body' nor the variable 'message.body'. It is weird, because if we add any piece of GatewayScript in the API assembly (for example a "console.log") before the invocation to our policy, then everything works fine and we can get access to request.body in the user defined policy.